goto next;
                score = score_trees(elem, hash2);
                if (*best_score < score) {
-                       char *newpath;
-                       newpath = xmalloc(strlen(base) + strlen(path) + 1);
-                       sprintf(newpath, "%s%s", base, path);
                        free(*best_match);
-                       *best_match = newpath;
+                       *best_match = xstrfmt("%s%s", base, path);
                        *best_score = score;
                }
                if (recurse_limit) {
-                       char *newbase;
-                       newbase = xmalloc(strlen(base) + strlen(path) + 2);
-                       sprintf(newbase, "%s%s/", base, path);
+                       char *newbase = xstrfmt("%s%s/", base, path);
                        match_trees(elem, hash2, best_score, best_match,
                                    newbase, recurse_limit - 1);
                        free(newbase);